HD64F3029XBL25V Renesas Electronics America, HD64F3029XBL25V Datasheet - Page 478

• Manufacturer Part Number: HD64F3029XBL25V
• Description: MCU 5V 512K,PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of HD64F3029XBL25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

12.3
Operations when the WDT is used as a watchdog timer and as an interval timer are described
below.
12.3.1
Figure 12.4 illustrates watchdog timer operation. To use the WDT as a watchdog timer, set the
WT/IT and TME bits to 1 in TCSR. Software must prevent TCNT overflow by rewriting the
TCNT value (normally by writing H'00) before overflow occurs. If TCNT fails to be rewritten and
overflows due to a system crash etc., the H8/3029 is internally reset for a duration of 518 states.
A watchdog reset has the same vector as a reset generated by input at the RES pin. Software can
distinguish a RES reset from a watchdog reset by checking the WRST bit in RSTCSR.
If a RES reset and a watchdog reset occur simultaneously, the RES reset takes priority.
H'FF
TCNT count
value
H'00
Internal
reset signal
Operation
Watchdog Timer Operation
Start
Figure 12.4 Operation in Watchdog Timer Mode
H'00 written
in TCNT
OVF = 1
WDT overflow
Reset
518 states
Rev. 2.0, 06/04, page 449 of 980
TME set to 1
H'00 written
in TCNT